CS241873B1 - Main pressure control valve - Google Patents

Abstract

The solution relates to a valve for controlling the main pressure for hydraulic systems of automatic transmissions, in particular vehicle transmissions. The valve consists of a valve body, a slide valve provided with a control collar and a relief collar. Indentations are formed in the relief collar, which, when the slide valve is moved further, connect the converter circuit channel with the waste channel.

Description

(54) (61) (23) Exhibition Priority (22) Entries 25 05 84 (21) PV 4788-84 (40) Published (45) Published

08 85

12 87

DOSTAL JAN ing.

SÝKORA JAN ing., PRAGUE

Main pressure control valve

The invention relates to a main pressure control valve for hydraulic systems of automatic transmissions, in particular vehicle transmissions. The valve consists of a valve body, a slide equipped with a control collar and a discharge collar.

In the removal collar, recesses are formed which interconnect the channel of the converter circuit with the waste channel when the slide is increased.

241,875 (51) Int. ClA

F 16 K 5/24

241 873

The invention relates to a valve for driving the main pressure for hydraulic systems of automatic transmissions, in particular in the case of transmission gears.

With etávajieíeh automatiekýah transmissions is the head! The pressure in the pressure control channel feeds and the control valve face and the force exerted by the control valve by the spring force · Excessive amounts of oil o o o o o o o o o o o o the small circuit * as soon as the bleed connection connects the space of the pressure to the * what about in the big roaaahu currencies! delivery of pump and rake in temperature and temperature changes and kiaetieká viscosity of oil * and 1 occaúaá spool adjustments different and for example, take care of the temperature and oohopnoot voatilu of this version * regulate pressure decreases · In the pressure branch between pump and valve to the oil cleaner command due to inlet abortion. Jo sioo possible to include in the circuit a suitable safety valve * pull solution yeah but complicated and uneconomical,

The above-mentioned disadvantages are countered by the vontilom for the main pressure apparatus according to the invention, which essentially consists of a valve body consisting of a valve body and a valve having a control collar and a collar and a discharge collar. In the draining of the slide valves, recesses are formed which, during the three strokes of the slide, connect the channel of the inverter circuit and the drain channel.

The use of the main pressure control rod according to the invention brings the advantage that it is at equilibrium with the operating temperature interconnecting the discharge collar of the slide valve and the pressure channel.

241 873 of the inverter circuit ducts with such a slot that excess oil can escape into the inverter circuit duct.

At low temperatures and at higher pump deliveries, this gap is greatly expanded until the recess in the drain collar connects the inverter circuit channel and the waste channel. Thus, the pressure in the inlet circuit channel and the increased pressure drop in the slit formed by the discharge collar position the sliders ensure that the excess pressure is safely vented and thus improves · the pressure control · thereby eliminating the possibility of failure of the olay or the inlet pipe and the need to include a safety valve in the circuit, thereby reducing complexity and improving economy

1 shows a schematic embodiment of a valve according to the invention, and FIG. 2 shows a cross-section through a drain ring, showing one of the possible designs of a recess of the drain ring.

In the valve body 1, a slide 2 is provided, provided with a control collar 3, lowering a collar 4 and a discharge collar 5, in which recesses 6 are formed. The pressure oil is supplied from the calibrated controlled pressure to the front collar 3 of the collar 2. The spring force 7 acts on the slide 2 by the opposite emer. In the equilibrium state, the slide 2 aligns in such a position that the edge of the discharge collar 5 creates a gap between the pressure control channel 8 and the converter circuit channel 9 so that excess oil flows through. · If a large amount of oil is to flow, or if the kinematic viscosity is higher due to the low oil temperature, it moves the valve 2 downwards until the recess »6 of the discharge collar 5 interconnects the inverter circuit channel 9 with the waste channel 10. Thus, the absolute value of th the accumulator in the inlet circuit of the inverter 9 and increases the pressure drop in the gap formed by the edge of the discharge collar 5 of the slide 2, thereby ensuring that excess pressure oil is safely drained from the control pressure channel 8 ·

Claims (1)

SUBJECT OF THE INVENTION 241 873 Valve> 1 * 0 main pressure control for hydraulic eyeteams of automatic transmissions, in particular the gearboxes *, which consists of a valve body · a slide equipped with a control and a sleeve, a collar lowering and a removable collar, indicated in the removable collar (2) they are formed in a counterbore (6) which connect the inverter circuit channel (9) and the drain channel (10) when the slider (2) is lifted;